Importing users and roles from Active Directory

I have successfully import users from AD. But i need clarification on this matter. Each user in AD already bind to specific roles, unfortunately the roles were left out during the import process ( I've verified by checking database). I noticed the AD import utility ask me to assign users to specific roles before import process begin, i did not select any of them since not all of them share the same roles.

So, is it possible for me to import only users,not users and roles separately?

Thanks